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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa3c2461fc6c657cb954ac813d802c58663ddda7da37755a967387703994d57' 
  AND token = 'hVtOI1kNBD7sYKE4sdZRRbYrQsw+nvqSIoMQEWt0Yw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}